Optimized Design of Broadband Radar Absorbent Material

摘要

Radar absorbent material (RAM) is widely used such as interference prevention between devices using radio waves and the wall of anechoic chamber. They have excellent characteristics depending on the applications, such as broadband characteristics, oblique incidence characteristics and both polarization characteristics. In recent years, various optimization methods have been used in RAM design studies. In this paper, we study the optimized design of two flat layers RAM with broadband characteristics by using Non-dominated sorting genetic algorithm-II (NSGA-II). The index of radio wave absorption amount is 20 dB corresponding to the absorption rate of 99 %, and the objective of this study is to obtain broadband characteristics satisfying the index. As a result, it is confirmed that broadband characteristics with relative bandwidth of 158 % can be obtained from 1.78 GHz with respect to 20 dB. In addition, two flat layers RAM with the maximum relative bandwidth is possible to be designed for the required minimum frequency at 1.78 GHz or higher by using the proposed optimized design method.